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问题 选择题

下列对性知识的认识中，不正确的是[ ]

A．性知识是一类科学知识

B．青春期时人应获得与其发育水平相适应的性知识

C．掌握必要的性知识有利于正确对待身心变化

D．讨论性知识是不健康的行为

答案

答案：D

单项选择题

引起急性前间壁心肌梗死闭塞的冠状动脉分支是

A．左冠状动脉前降支
B．右冠状动脉后降支
C．左冠状动脉主干
D．左冠状动脉回旋支
E．右冠状动脉右室前支
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单项选择题

A: I feel rather sick this morning. I don't think I can concentrate on the work. B: ______ A: I'm not sure, but I have got a bad headache.

A．How long have you been sick

B．How are you feeling now

C．Do you have a high temperature

D．I'm sorry to hear that and I can't help you now.
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